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Frekuensi pengulangan pulsa (PRF, pulse re … Frekuensi pengulangan pulsa (PRF, pulse repetition frequency) adalah jumlah pulsa (atau denyut elektromagnetik) per satuan waktu yang dipancarkan sebuah pemancar . Istilah ini digunakan dalam berbagai bidang teknis, terutama radar dengan . Frekuensi pengulangan pulsa biasanya diukur dalam ukuran detik, dan kebalikannya adalah interval pengulangan pulsa (PRI).a adalah interval pengulangan pulsa (PRI).
, The pulse repetition frequency (PRF) is th … The pulse repetition frequency (PRF) is the number of pulses of a repeating signal in a specific time unit. The term is used within a number of technical disciplines, notably radar. In radar, a radio signal of a particular carrier frequency is turned on and off; the term "frequency" refers to the carrier, while the PRF refers to the number of switches. Both are measured in terms of cycle per second, or hertz. The PRF is normally much lower than the frequency. For instance, a typical World War II radar like the Type 7 had a basic carrier frequency of 209 MHz (209 million cycles per second) and a PRF of 300 or 500 pulses per second. A related measure is the pulse width, the amount of time the transmitter is turned on during each pulse. After producing a brief pulse of radio signal, the transmitter is turned off in order for the receiver units to hear the reflections of that signal off distant targets. Since the radio signal has to travel out to the target and back again, the required inter-pulse quiet period is a function of the radar's desired range. Longer periods are required for longer range signals, requiring lower PRFs. Conversely, higher PRFs produce shorter maximum ranges, but broadcast more pulses, and thus radio energy, in a given time. This creates stronger reflections that make detection easier. Radar systems must balance these two competing requirements. Using older electronics, PRFs were generally fixed to a specific value, or might be switched among a limited set of possible values. This gives each radar system a characteristic PRF, which can be used in electronic warfare to identify the type or class of a particular platform such as a ship or aircraft, or in some cases, a particular unit. Radar warning receivers in aircraft include a library of common PRFs which can identify not only the type of radar, but in some cases the mode of operation. This allowed pilots to be warned when an SA-2 SAM battery had "locked on", for instance. Modern radar systems are generally able to smoothly change their PRF, pulse width and carrier frequency, making identification much more difficult. Sonar and lidar systems also have PRFs, as does any pulsed system. In the case of sonar, the term pulse repetition rate (PRR) is more common, although it refers to the same concept.n, although it refers to the same concept.
, تردد تكرار النبضة (بالإنجليزية: (Pulse repetition frequency (PRF) هو عدد النبضات خلال وحدة زمن معينة (مثلاً، ثوانٍ). لتردد تكرار النبضة أهمية خاصة في نمط دوبلر النبضي.
, Die Impulsfolgefrequenz (englisch Pulse Re … Die Impulsfolgefrequenz (englisch Pulse Repetition Frequency, PRF, wörtlich „Pulswiederholfrequenz“) eines Radargerätes ist die Anzahl der gesendeten Impulse bezogen auf die Dauer der Zählung. Das Radargerät sendet einen kurzen hochfrequenten Impuls mit der Sendeimpulsdauer (Impulsbreite, engl. Pulse Width) und wartet zwischen den Sendeimpulsen auf die Echosignale. Die Zeit vom Beginn des einen Sendeimpulses bis zum Beginn des nächsten Sendeimpulses wird Impulsfolgeperiode (englisch Pulse Repetition Time, PRT) genannt und ist der Kehrwert der Impulsfolgefrequenz: Die Zeit zwischen den Sendeimpulsen ist allgemein die Empfangszeit. Diese ist immer kleiner als die Differenz zwischen der Impulsfolgeperiode und der Sendezeit und wird manchmal zusätzlich begrenzt durch eine so genannte Totzeit. In der Totzeit vor dem nächsten Sendeimpuls werden bei modernen Radargeräten Systemtests (Built-in test equipment BITE) durchgeführt.uilt-in test equipment BITE) durchgeführt.
, La fréquence de répétition des impulsions … La fréquence de répétition des impulsions radar (PRF, Pulse Repetition Frequency) est le nombre d'impulsions transmises chaque seconde par un radar. Son inverse appelé « période inter–impulsions » (PRT, Pulse Repetition Time) mesure le temps écoulé entre le début d'une impulsion et le début de la suivante. La fréquence de répétition des impulsions est une notion importante car elle détermine à la fois la distance maximale de détection de la cible et le maximum de vitesse Doppler qui peut être déterminé avec précision par le radar. Par extension, la fréquence de répétition des impulsions peut s'appliquer dans le domaine des ondes sonores et lumineuses.e domaine des ondes sonores et lumineuses.
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تردد تكرار النبضة (بالإنجليزية: (Pulse repetition frequency (PRF) هو عدد النبضات خلال وحدة زمن معينة (مثلاً، ثوانٍ). لتردد تكرار النبضة أهمية خاصة في نمط دوبلر النبضي.
, The pulse repetition frequency (PRF) is th … The pulse repetition frequency (PRF) is the number of pulses of a repeating signal in a specific time unit. The term is used within a number of technical disciplines, notably radar. In radar, a radio signal of a particular carrier frequency is turned on and off; the term "frequency" refers to the carrier, while the PRF refers to the number of switches. Both are measured in terms of cycle per second, or hertz. The PRF is normally much lower than the frequency. For instance, a typical World War II radar like the Type 7 had a basic carrier frequency of 209 MHz (209 million cycles per second) and a PRF of 300 or 500 pulses per second. A related measure is the pulse width, the amount of time the transmitter is turned on during each pulse.ransmitter is turned on during each pulse.
, Die Impulsfolgefrequenz (englisch Pulse Re … Die Impulsfolgefrequenz (englisch Pulse Repetition Frequency, PRF, wörtlich „Pulswiederholfrequenz“) eines Radargerätes ist die Anzahl der gesendeten Impulse bezogen auf die Dauer der Zählung. Das Radargerät sendet einen kurzen hochfrequenten Impuls mit der Sendeimpulsdauer (Impulsbreite, engl. Pulse Width) und wartet zwischen den Sendeimpulsen auf die Echosignale. Die Zeit vom Beginn des einen Sendeimpulses bis zum Beginn des nächsten Sendeimpulses wird Impulsfolgeperiode (englisch Pulse Repetition Time, PRT) genannt und ist der Kehrwert der Impulsfolgefrequenz: ist der Kehrwert der Impulsfolgefrequenz:
, La fréquence de répétition des impulsions … La fréquence de répétition des impulsions radar (PRF, Pulse Repetition Frequency) est le nombre d'impulsions transmises chaque seconde par un radar. Son inverse appelé « période inter–impulsions » (PRT, Pulse Repetition Time) mesure le temps écoulé entre le début d'une impulsion et le début de la suivante. La fréquence de répétition des impulsions est une notion importante car elle détermine à la fois la distance maximale de détection de la cible et le maximum de vitesse Doppler qui peut être déterminé avec précision par le radar. Par extension, la fréquence de répétition des impulsions peut s'appliquer dans le domaine des ondes sonores et lumineuses.e domaine des ondes sonores et lumineuses.
, Frekuensi pengulangan pulsa (PRF, pulse re … Frekuensi pengulangan pulsa (PRF, pulse repetition frequency) adalah jumlah pulsa (atau denyut elektromagnetik) per satuan waktu yang dipancarkan sebuah pemancar . Istilah ini digunakan dalam berbagai bidang teknis, terutama radar dengan . Frekuensi pengulangan pulsa biasanya diukur dalam ukuran detik, dan kebalikannya adalah interval pengulangan pulsa (PRI).a adalah interval pengulangan pulsa (PRI).
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تردد تكرار النبضة
, Frekuensi pengulangan pulsa
, Impulsfolgefrequenz
, Fréquence de répétition des impulsions radar
, Pulse repetition frequency
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